Improvement in steam safety-valves



@uitrit tetra @anni 'ffirn 'JOSEPH Gr. HARRISON, OF NEVV YORK, N. Y.

Letters Patent No. 67,538, dated August V6, 1867.

IMPROVEMENT IN STEAM SAFETY-VALVES.

T0 ALL WHOM IT MAY CONCERN:

Y Be it known that I, JOSEPH G. HARRISON, of the city, county, and State of New York, have invented-a c`er' tain new and useful Improvement in Lock-Up Safety-Valves, of which the following is a full, clear,- and Vexact description, reference being had to the accompanying drawing, forming part ofv this specification,l and in-whicb- Figure 1 represents an elevation of a lock-up safetyva-lvc constructedaccordin/g to my improvement, a portion thereof being shown in section.

Figure 2, a vertical section of the same, in a plane at right angles to iig. 1.

Figure 3, a plan of the valve-seat and chamber or case on which the same is arranged.

Figure 4, an inverted plan of an upper case or chamber. l

Figure 5, a top view or plan of such upper case or chamber, with its lids or covers removed, and

Figure 6 an inverted plan of said lids or covers.

Similar letters of reference indicate corresponding parts.

The nature of my invention consists, firstly, in combination with a close or lock-up case of a ball or globefaced valve carrying a pendulum or suspension-weight', also, in such connection,'a weight 0r weights above the valve; likewise in a novel construction, attachment, and mode of closing or securing an outer lock-up chamber to the valve. By this my improvement a freer, easier, and more certain or steady action is secured to the valve, which will be foundA especially advantageous in its application to the boilers of sea-going vessels and locomotives, or wherever the position of the valve is liable to he changed from aperpendicular to one more or less inclined to the horizon, said improvement also affording great facility for attaching and detaching a lock-up chamber to the valve with perfect security of the same when locked, and, on being unlocked, admitting of easy acces's'for adjustment of the weights or examination, and so forth, of the valve.

Referring to the accompanying drawing, the box or structure containing the valve is here represented 'as made up of two separate chambers or cases, A B, the one mounted upon the other in alocking and detachable manner, which construction is preferred for reasons hereinafter given. The bottom case, A, is secured by a lowerlange, a, and permanent joint to the boiler. The entrance C to this chamber, as also the escape or outlet D to the upper chamber, may be provided with suitable partitions or projections, I1 c, arranged to intercept or prevent any tampering with the valve, either from the interior or exterior of the boiler. E is the valve-seat or socket, arranged i'n the top of the" lower chamber, and F the valve controlling a passage, d, which establishes the communication between the upper and lower chambers A B. This valve, F, whichrmay be directed to its seat in fallingby guides e, is of a globe-faced construction, and has pendent from it, in a rigid manner, what may be termed a pendulum or suspension-weight, G, which secures to the valve a close t in deviations of it from a line perpendicular to the horizon, and free action, under allcircumstances, with, by its frequent oscillation when closed, perfect security against becoming stuck. To enlarge or further utilize this feature, however, it is desirable also to load the valve above, say, by a weight o r upper box, H, to the valve containing` weights, I, that not only serve to give increased steadiness and freedom of action to the valve, but which, on opening ti..

| case, may be inserted or removed at pleasure to adjust tbe-valve to lift under any desired or given pressure, the pendulum-weight G being of itself materially less than what is necessary to control the maximum pressure to which the boiler should be subjected. f

Not only in seaegoing vessels, where the valve is exposed to a rolling motion, will this ball and socketpendulum-weighted valve be relieved of sticking or binding when it should lift, but wherever there is any jar or vibration, and few boilers are free from such, the valve will be kept loose in its seat, and ever ready for action whenever the pressure in the boiler exceeds the load on the valve, and thus is perfect safety secured.

While a different construction of lock-np case may be adopted, I prefer to makek the two chambers A B separate structures,'as hereinbefore referred to, and so connect them that the upper one, B, maybe attached with facility and in close contact to the lower one, and, when the case is unlocked, so that it may readily be detached; also may be unopened to adjust the valve er weights, I, without removal ofthe upper case.

The advantages acquired by such a construction and attachment of the upper chamber B, as regards the facility it aifords for erection, repair, adjustment, or examination of the valve generally, are' self-evident. The

means I employ to carry into effect suh-a 'construction of the valve-box or cassiere as follows: On the top of the lower'eatse A is a. rimprojeetiomf, having inclined Handige-sections, g,'a.nd the upper case B, provided at its bottom with similar but reversely-inclined Harige-sections, h, which, enteringbetween the inclined milonga-sections, g, nre made, on suitably turning the uppei cva-se B, to lock under' the section g, an l so hold the two casestngether, a reverse turning of the upper case serving to unlock the attachment, which, however, 'may be secured against or prevented, when the lid of the cese is looked, by any suitable means, say by afpin made to pass through any two orvmoreof the flange-sections g' la. l is the lifting-chain, connected withv the valve for raising or working the lutte-r by hand, said chain passing through the lid of the uppercase, and being operated direct or otherwise, es desired. This lid is mede up of sections, K L, the one, K, at least, of which should be secured in a manner similar to-tl1a.t adopted for holdingthe two cases together, byformingl the top of such upper case, B,'Wit.h inclined hanged sections, i.' and under surface ,of the lid portion K with reverselyinclined Heilige-sections, j, to establish a. lo'ek, While the remaining lid portion L should have a. lip or' strip, 7c, mede to t under the lid-section K, yemi so that, when the portion L is secured by a. padlock, M,pa.ssed through ears m m, lprojecting from-the upper case and .lid portion L, the interior of the valveoase is inaccessible, but on unlocking the case and removing the padlock, may be got at for ordinary purpose without removing,` the entire` lid, by simply lifting off the setion L of the same. I 'l What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with :block-up valve-box or case, of u. ball or globe-faced valve, F, working in a. suitable socket or seat, and carrying a pendulum-Weight, Gr, for operation substantially as and for the purpose herein set forth. l .E

2. The combination of the removable weights I with the globe-shaped valve F and pendulum-weight G,

substantially es and for the purpose specified.

JOSEPH G. HARRISON.

Witnesses:

J. W. Gnomes, G. W. REED. 

